Method of finishing surfaces of materials composed in part of vegetable fibers



t 1933- c. P. LEY NER :1- AL METHOD OF FINISHING SURFACES OF IATBRIALs COIPOSED IN PART OF; VEGETABLE FIBERS Filed June'23 1932 VIII/0 1117%);

UNITED. STATES PATENT OFFIC METHOD OF FINISHING SURFACES OF MATERIALS COMPOSED IN PART OF VEGETABLE FIBER Charles P. Leyner and Rosa M. Leyner, Denver,

Colo.

Application June 23, 1932. Serial No.,618,856

6 Claims. (CI. 92-68) This invention relates to improvements in mentation of tiles and mouldings made from thismethods for surfacing fiber boards of the type kind of material. that are made from compressed vegetablejibers. It has been found that where rotary cutters In the erection of buildings it is getting quite employing blades, such as are used in connection customary to employ fiber boards of different with the manufacture of wooden mouldings and 53 type like those made from sugarcane bagasse, similar wooden building material are employed corn stalk, wood fiber, etc. in connection with fiber boards the resultant er boards of the type referred to are very finish is objectionable because it is hard and good insulators against heat and cold and are glossy and is therefore a good reflector for sound also poor conductors of sound vibration and are waves and at the same time it does not have the therefore admirably suited for building confinished appearance that similar articles have struction. In many places the inner walls comwhen made in accordance with the process herein posed of fiber board are left exposed and uno be descr bedfinished for different reasons, and when this is Having thus briefly described the invention and the case it is desirable to give them a finish that ome of its adv it will now be described 73 will produce a pleasing and ornamental appearin greater detail and for this reason reference ance and for this purpose we have invented a l be ad t t accompanying drawing in method of finishing the surface of fiber boards which the invention has been illustrated in such that will impart to these surfaces a peculiar fina way that the process and the resultant product ish that improves the appearance and also has 8 be c y defined and in which;

a very beneficial and desirable effect in connec- 1 is a p a View Of a' a u e hat tion with sound reflection and which make the is ornamented in a certain y y means of the fiber boards thus finished especially well adapted process he described; for use in rooms devoted to radio broadcasting or g- 2 shows e form of moulding a has the testing of musical instruments, radios, etc. been made by means of an apparatus carrying 80 This invention, briefly described, consists in Out the P subjecting the surface of the fiber board to the 3 is & i s a slde eievatlon of e action oi a coarse abrasive, such as coarse sand p r n o an, apparatus y d in car ying or carborundum paper or to the action of a ro- Out this p so tating abrasive wheel made of carborundum or 4 is a section through One Of h depressome equivalent abrasive. The effect ofsubjeetsions out by the abradmg W l nd shows the ing the surfaces to the action of an abrasive is to D that is'l-irodllced by this p a d release the ends of the vegetable fibers and re- Fig-.5 is a section to 8- enlarged le and move from the same the pulp that adheres to i intended to illustrate the d ced by the 35 them so as to produce a nap which, when the Operation of h process! 90 abrasive is moved in one direction only during f e g fif d f 53 ang or piece 0 r e re erre 32 1;322:33 gggi g gg 2:12 i g r gggfi to in the above parts of the specification, whose surface has been ornamented by having radially 3 33; 532:; g g g g gg g fg surface extending depressions 7 cut in its surface. These 93 depressions are cut by means of a rotating wheel The e surface that 15 produce? b the 8 provided with a cutting surface 9 made of carmethod whlch forms the Subject of thls mven' borundum or some similar coarse grained abration not only improves the appearance, but as m In Fig 3 th t for th m k h above intimated, has a very imp effect been indicated by reference numeral 10 while 100 i c ne tion wit o d reflection because it the fiber that is operated on has been indicated appears that when sound waves strike the velby reference er l 11, The groove that is l y a ot e e e to any pp cut by the wheel and which corresponds to the able extent, whereas, if the surface is left hardone i di at d by numeral 7 in Fig. 1 has been and smooth as it iS with the original finish, then designated by reference numeral 12 Th ma, 105

the s d e e t s a a y increased. chine shown is merely a diagrammatic repre- In addition to improving the appearance and sentation of a machine that can be used for this the sound reflecting characteristics of the fiber purpose and consists of a stationary frame memboards by the process which will be. herein deber 13 that has rotatably secured to it a shaft 14 scribed, this process also facilitates the omawhich carries a belt wheel 15. A link 16 has its end pivotally connected at 17 with the frame 18 to which the wheel 8 is joumaled.- Two belt wheels which are represented by reference numeral 19 are pivoted on the shaft 17 and a belt wheel 20 is connected to the shaft 21 that carries the wheel 8. When shaft 14 is rotated by a motor, the wheel 8 will rotate in the direction of the arrow and by moving the frame forwardly while the wheel is rotating the surface of the fiber will be abraded so as to leave a nap 22 composed of the outer ends of the vegetable fibers which the action of the abradant has cleaned and separated from each other and laid in one direction so that the surface resembles the surface of velvet.

Although in the examples illustrated'the surface has been acted upon by means. of a wheel that changes the formation of the surface so as to produce lines or curved effects as in the moulding it is'to be understood that the surface can be processed in the manner described without ornamenting the same and when this is done a room that is finished by means of fiber board subjected to treatment like the one described will give an appearance resembling that which would be obtained by having a velvet covering of the same color.

Attention ,is called to the fact that the fiber boards that are employed for this purpose can be dyed'so as to give any colored effect desired without interfering with the proper functioning'of the nap in the prevention of sound reflection.

From the above it will be apparent that we have produced an improved method for finishing fthe surface of boards composed principally of vegetable fibers which not only improves the appearance, but also alters the characteristics of the surface in regard to sound reflection and which also prevents the reflection of light to a great .action of an abrasive member and thereby producing designs in intaglio whose surfaces are covered with a nap comprising the ends of fibers.

2. The method of producing ornamental designs in intaglio in articles made from vegetable fiber which consists in grinding depressed areas by the action of an abrasive member, whereby designs in intaglio are produced and whereby the surfaces of the designs are given a velvety finish.

3. The herein described method of ornamenting the surface of material composedof vegetable fibers consisting in removing a portion of said material to produce designs in intaglio.

4. The herein described method of ornamenting the surface of material composed of vegetable fibers consisting in removing said material by a grinding action to produce designs in intaglio.

5. The herein described method of ornamenting fibers consisting in removing a portion of said material by an abrasive action to produce de-' signs in intaglio.

6. The herein described method of ornamenting the surface of material composed of vegetable fibers consisting in removing a portion of said material by a rotary abrasive action to produce designs in intaglio.

CHARLES P. LEYNER. ROSA M. LEYN'ER. 

